爆燃压裂技术对水泥试样致裂实验研究

为模拟爆燃压裂技术的破岩效果和裂缝形态，进行了水泥试样致裂实验。制作了含有模拟射孔孔眼的?244.5 mm套管，外维为?1 600 mm×1 000 mm的水泥试样9组，并采用现场常用的航天复合推进剂和军工双基药进行实验。在实验基础上，与层内爆炸技术和重复强电冲击波技术进行储层致裂机理对比分析。研究表明，爆燃压裂技术对9组水泥试样具有100%致裂效果，裂缝条数在2~4条，裂缝缝宽在厘米级，且水泥试样的顶部缝宽要大于中部。随着火药用量减少，井筒内峰值压力减小，岩石裂缝条数减少，裂缝宽度减小。其造缝机理和形态有别于使用炸药的层内爆炸技术和使用脉冲功率负载及含能材料的可重复强电冲击波技术。

The Gas from Deflagration Fracture to Crack the Cement Test Sample Experiment

In order to get better rock breaking effect, plugging removal effect and fracture forms, cement sample fracture experiment has been done, 9 cement samples by using ?244.5 mm casing with reserved perforation holes and ?1 600×1 000 mm external diameter. The ground experiment has taken common aerospace composite solid propellant and military dual-base powder. On the basis of experiments, a comparison between intra-layer explosion technology and repeated strong electric shock wave technology. The result shows that the gas from deflagration fracture can make fractures to all 9 samples with 2～4 fractures in centimeter level, and upper fracture width is more than middle part. The peak pressure, the number of fracture decrease and fracture width decreases by less powder. Its fracture mechanism and forms are different from these two above.